## Figure 4: A screen shot from a *chunk* version of an e-Proof for the product rule for continuous functions

The accompanying audio for this screen says:

In the third chunk, we set up an overall delta value, and put together the information from the second chunk to show that if the modulus of x minus a is less than this delta, then our original modulus expression is less than epsilon.

© ISDDE 2011 - all rights reserved

Alcock, L., Wilkinson, N. (2011) e-Proofs: Design of a Resource to Support Proof Comprehension in Mathematics.

Retrieved from: http://www.educationaldesigner.org/ed/volume1/issue4/article14

*Educational Designer,*1(4).Retrieved from: http://www.educationaldesigner.org/ed/volume1/issue4/article14